Back draft vent for ranges



May 16, 1939. J, w BARKER 2,158,685-

BACK DRAFT VENT FOR RANGES Filed Feb. 10, 1938 2 Sheets-Sheet l May 16,1939'. J, w. BARKER I BACK DRAFT VENT FOR RANGES 2 Sheets-Sheet 2 r I I36g) 6,

Filed Feb. 10, 1958 g "IHH Patented May 16, 1939 UNITED STATES PATENTOFFiCE 6 Claims.

This invention relates to a damper or venting device for stoves orranges and the like and more particularly combination ranges in whichboth gas and solid fuel is employed.

The principal object of the present invention is to provide a damper forstove oven and broiler compartments which is automatically operated byan attachment from a gas cock and wherein means provided to prevent backpressure of gases within the said oven or broiler compartment.

A further object is the provision of a damper adapted to be positionedwithin the smoke bag or hump at the rear of the stove and having meansassociated therewith which will open with the damper to provide reliefin the event of back draft.

These and other objects and advantages will be apparent as thespecification is considered in connection with the accompanyingdrawings, in which:

Figure 1 is a rear view of the damper frame and damper in assembledposition partially with in the smoke bag, with the damper in closedposition;

Figure 2 is an enlarged section on the line 2-2 of Figure 1;

Figure 3 is an enlarged rear view of the damper frame with the damperand damper door in open position; and

Figure 4 is a section on the line 44 of Figure 2.

Referring more particularly to the drawings, wherein like referencecharacters designate similar parts throughout the several views, numerall designates the rear wall of a combination range oven 2. The oven isheated in the conventional manner, either by products of combustionpassing around it from a combustion chamber or fire pot, not shown, orby the heat from a gas burner, not shown, located within or beneath theoven. The products of combustion from the fire pot, after circulatingaround the oven, pass beneath the oven and are discharged outwardlythrough suitable openings, also not shown, into the lower end of avertically arranged main discharge flue or smoke bag 3, of conventionalconstruction, suitably secured to the rear wall of the range, wherebythe flue gases are caused to pass upwardly therethrough and thence intothe atmosphere.

Vents or openings 4 are provided in the rear wall 9 of the oven, at theupper end thereof, for permitting the flue gases within the oven toescape into the smoke bag 3. A substantially rectangular damper frame 5is positioned within the smoke bag and is attached to the oven wall l,approximately over the vents 4 therein, by means of screws or the like5. One end of the damper frame extends outwardly through a side wall 6of the smoke bag, which. extended end is provided with a bulged casingor housing portion 1, which vents into the room through an open outerend 3. The frame 5 is formed with a relatively narrow flange 9,extending around the periphery thereof, which is recessed or undercut atits inner end to provide a groove or channel Ill. An inwardly extendingflange l2, formed on the upper and lower edges of a substantiallyrectangular, relatively thin plate or damper i l, fits within the grooveit and permits the damper to be slidably actuated within the frame, ashereinafter described. Openings it in the damper plate coincide with theoven discharge openings 4 for controlling the passage of oven gases orproducts of combustion from the oven directly to the smoke bag 3.

a A frame M is positioned over the open end 8 of the damper frame casingportion l and is removably secured thereto by means of a nutted screw orbolt 95, which extends through a slotted lug It on the side of thecasing. A flapper door l! is pivotally attached to lugs it on the upperend of frame M by bolts or the like it, whereby the casing opening 8 maybe closed or opened, as will presently be described. The outer end ofthe damper plate I! is reduced to form a handle 20 which slidablyextends through a recess or cutout portion 2| in the frame M. A lever 22is pivotally connected at one end to a stud 23 on the end of the damperhandle 2i? and at its other end to a rack lever, not shown, which inturn is suitably connected to a gas cock, not shown, whereby rotation ofthe gas cock to on and off positions will actuate the slide damper in awell known manner, to open and closed positions respectively.

The damper handle 29 is provided with a lug or fin 24, adjacent itsinner end, and a lug or fin 25 is also formed on the rear face of thedoor ll, to one side and adjacent the upper end thereof. The lugs 2d and25 are so positioned that, when the gas is turned on to supply the ovenburner, and upon the consequent outward sliding movement of the slidedamper II, the lug 24 is caused to abut the door lug 25 and thereby pushthe said door outwardly or ajar, to the open position shown in Figure 3and in which position the openings l3 in the damper are in register withthe vent openings 4 in the rear wall of the oven, thus opening thedamper. Upon a reverse movement of the damper the openings 4 and I3 willbe out of register and the door I! will be moved to closed position bygravity.

It will thus be seen that when the gas cock handle has been turned tooff position, the slide damper II, as shown in Figures 1 and 2, coversand closes the discharge openings 4 in the oven wall and the flapperdoor I1, at the outer end of the damper casing I, is closed to theatmosphere. Rotation of the gas cock handle to on position causes thedamper plate I l to be moved outwardly in which position, the damperopenings l3 coincide with the discharge openings 4 in the oven wall andthe flapper door I! is moved to open or ajar position, as shown inFigure 3.

When the slide damper and flapper door are in the open positiondescribed above, the flue gases generated by the gas burner within theoven are permitted to pass outwardly through the damper openings intothe main discharge flue or smoke bag from whence they pass upwardly tothe atmosphere.

It is well known in the art that a back draft in the smoke bag or ovenresults in the gases passing down the bag and back into the oven wherethey mingle with the gases within the oven and often cause an explosion.Circulation of necessary fresh air is also thus cut off from the burner.By virtue of the present construction, the flapper door is in openposition throughout the entire venting operation of the oven andtherefore any back draft of flue gases will cause the downwardlytravelling gases to pass laterally and outwardly through the openflapper door into the atmosphere of the room instead of passing throughthe damper openings and back into the oven, with the aforementioneddeleterious results.

Thus it will be seen that the operation of the damper is entirelyautomatic and that in addition to venting the oven in an improvedmanner, an efficient and very satisfactory means for preventing backdraft of gases within the oven is provided.

While a preferred embodiment of my damper has been shown and describedit is to be understood that various modifications in the design andconstruction may be made without departing from the scope and spirit ofthe appended claims. Should it be desired, the damper may also beoperated manually by disconnecting the lever 22 and gas cook connectinglevers from the damper handle, in which case the slide damper may bemoved to open and closed position by hand, or other means.

Having thus described my invention what I claim is:

1. In a dual range, a main discharge flue, a compartment having ventsopening into said flue, a frame in said flue having a sliding dampermeans movable therein for controlling said vents, a vent on one end ofsaid frame communicating with the flue and the atmosphere for ventingback flue gases, and pivoted means for closing said vent, and means forsimultaneously actuating said pivot means and said damper.

2. In a range, a main discharge flue, an oven having vents opening intosaid flue, a frame extending into and supported in said flue, a damperslidably positioned in said frame for controlling said vents, and a venton one end of said frame and means for closing said vent for ventingback draft gases from said flue directly to the atmosphere, and meansfor simultaneously actuating said means and said damper.

3. In a range, a main discharge flue, an oven having vents opening intosaid flue, damper supporting means in said flue and extending throughthe wall of said flue, a damper slidably positioned in said supportingmeans and having a portion thereof extending through the wall of saidflue, a vent in the outer end of said damper supporting meanscommunicating with the flue and with the atmosphere for venting backdraft gases from the flue direct to the atmosphere and a pivoted doormember for opening and closing the vent, and means for simultaneouslyactuating said pivoted door and said damper.

4. In a range, a main discharge flue, an oven having vents opening intosaid flue, a frame positioned in said flue and extending through oneside thereof, a damper slidably positioned in said frame and having oneend extending through the side of said flue, a vent on said frame incommunication at opposite ends with said flue and the atmosphere forventing back draft gases directly to the atmosphere, and a pivoted doormember on the extended end of said frame for closing said vent, andmeans for simultaneously actuating said means and said damper.

5. In a dual range, a discharge flue, an oven having vents opening intosaid flue, a damper for controlling said vents, a chamber communicatingat one side with said flue, and having an opening for venting into theroom in which the stove is being operated, means for closing saidopening and means for simultaneously actuating said first mentionedmeans and damper.

6. In a dual range, a discharge flue, an oven having vents opening intosaid flue, a damper for controlling said vents, a back draft chambercommunicating with said flue, said chamber having an opening ventingdirectly into the room in which the range is being operated, a door forsaid opening operable by gravity to closed position, and means forsimultaneously opening said door and damper.

JESSE W. BARKER.

